Cohn P M <br/><br/>
Free rings and their relations 

 -  1971 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>20004 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Group theory
<br/><br/><label>Dewey Class. No.: </label>B27, L12